<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>多维数组</title>
</head>
<body>
    <script>
        let arr = [['df','rt'],['dfd','fsf']];
        console.log(arr[1][0]);

        arr[1][0] = '45858';
        console.log(arr);
    </script>
</body>
</html>